package com.lagou.client;

import com.lagou.service.RpcRequest;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.serialization.ClassResolvers;
import io.netty.handler.codec.serialization.ObjectDecoder;
import io.netty.handler.codec.serialization.ObjectEncoder;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class RpcConsumer {

    //创建线程池对象
    private static ExecutorService executor = Executors
            .newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private static UserClientHandler userClientHandler;

    //1.创建一个代理对象 providerName：UserService#sayHello are you ok?
    public Object createProxy(final Class<?> serviceClass, final Object providerName) {
        //借助JDK动态代理生成代理对象
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),
                new Class<?>[]{serviceClass}, new InvocationHandler() {
                    public Object invoke(Object proxy, Method method, Object[] args)
                            throws Throwable {
                        //（1）调用初始化netty客户端的方法
                        System.out.println("------");
                        if (userClientHandler == null) {
                            initClient();
                        }

                        // 设置参数
                        if (providerName instanceof String) {
                            String s = (String) providerName;
                            userClientHandler.setPara(s + args[0]);
                        } else {
                            System.out.println("-=---=====------");
                            RpcRequest rpcRequest = new RpcRequest();
                            rpcRequest.setMethodName(method.getName());
                            rpcRequest.setClassName(serviceClass.getName());
                            rpcRequest.setRequestId("ddddasf");
                            rpcRequest.setParameters(args);
                            Class<?>[] parameterTypes = method.getParameterTypes();
                            rpcRequest.setParameterTypes(parameterTypes);
                            userClientHandler.setPara(rpcRequest);
                            System.out.println("-===========================");
                        }

                        // 去服务端请求数据
                        System.out.println("-=========");
                        return executor.submit(userClientHandler).get();
                    }
                });


    }


    //2.初始化netty客户端
    public static void initClient() throws InterruptedException {
        userClientHandler = new UserClientHandler();

        EventLoopGroup group = new NioEventLoopGroup();

        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        //  pipeline.addLast(new StringEncoder());
                        //   pipeline.addLast(new StringDecoder());

                        pipeline.addLast("encoder", new ObjectEncoder());

                        pipeline.addLast("decoder", new ObjectDecoder(Integer.MAX_VALUE,
                                ClassResolvers.cacheDisabled(null)));

                        //    pipeline.addLast(new RpcEncoder(RpcRequest.class, new JSONSerializer()));
                        pipeline.addLast(userClientHandler);
                    }
                });

        bootstrap.connect("127.0.0.1", 8990).sync();

    }


}
